Along with the re-opening of Vasari Corridor in Florence, this storied passageway has also re-opened to visitors for 3 different tour options. One of them, the night tour, is only currently available in Italian but I might imagine that it's not impossible that will be extended to English in the future.
From Finestre sull'Arte....
https://www.finestresullarte.info/en/museums/rome-reopens-the-passetto-di-borgo-the-secret-corridor-that-connected-the-vatican-to-castel-sant-angelo
"Wanted in Rome"....
https://www.wantedinrome.com/news/rome-secret-escape-route-of-popes-opens.html
...and the Coopculture website, which is the official vendor for tickets:
https://www.coopculture.it/en/events/event/passetto-di-borgo-the-popes-escape-route-00001/
Tickets are currently only available into early January, and Finestre sull'Arte (towards the end of the article linked above) reports that work on the passageway is ongoing for another 3 years to improve accessibility and enhance the historic perspective for visitors for all ages.
Merry Christmas!
Happy Hanukkah!
Joyous Kwanzaa!